Planmeca Proline XC Technical Manual page 251

ELECTRICAL PARTS AND THEIR FUNCTIONS
Temple rest motor
Rotation motor
Cassette motor
Technical Manual
When it reaches one end of it's movement range it will slow down and stop in the end. When
the operating button is released the motor stops immediately.When the motor is moving, it's
coordinates are updated in the mm-display. They are calculated from the motor steps and
show the position relative to the sharp layer (00) that is programmed during the alignment
procedure. The position of the sharp layer relative to the motor movement range varies and is
not the same for all equipment. For this reason the movement is not always from -30 to 09 but
can be somewhat different. Still the full range is always 39 mm.
The motor has one reference sensor on the LAYER/HOLD LIMITS circuit board. Every time
when the sensor is passed to the positive direction the position information is checked and
corrected if necessary. If the layer adjust mechanism or the keyboard processor is replaced it
may happen that the motor is not driving in correct range and cannot be driven past the sen-
sor to find the reference point.
To solve this the system in the service settings mode does not stop the motor at the point it
considers to be the mechanical end but continues at slow speed to enable you to drive it past
the sensor in positive direction (to be sure pass it first in negative direction). Care must be
taken not to drive the motor to the mechanical stop that may damage the gears.
The temple rest motor is located beside the layer adjust motor. It's function is to keep the
patient centered in the right position during the exposure and release the patient after the
exposure. It is a stepper motor and it gets it's drive from the keyboard processor.
When the motor is activated the system checks with a sensor on the LAYER/HOLD LIMITS
board whether the temple rests are open or closed. If the sensor is active (near the magnet) it
is detected as a closed position and the motor is driven into open direction a certain length. If
the sensor was passive the motor is driven into closed direction as long as it finds the sensor.
Note that opening is performed at full speed but closing is done more gently not to startle the
patient.
This motor is located in the rotating part beside the generator processor board. It is rotating
the rotating part during the exposure and return. The drive to this stepper motor is delivered
by the generator processor.
÷This motor cannot be operated independently but is activated by the system whenever the
rotation is needed. The operating range of the rotation is controlled by two sensors fixed to
the rotating part frame.
The rotation start sensor defines the starting point (home position) of the rotating arm. When
pressed READY the system will continuously seek for the sensor and rotate the arm to it if it
was pushed aside. Note that if the arm was pushed over to wrong side of the sensor (not
towards center) the system tries to find the sensor by rotating the arm but in wrong direction.
In this case the arm must be pushed over the sensor to the actual operating range and thus
enable the system to find the sensor.
The rotation end sensor is polled in the end of the rotation. The rotation must stop on the sen-
sor, otherwise an error is generated. If the sensor was reached and gone over the rotation is
stopped immediately with an error.
The cassette motor is located on the top of the cassette holder in the cassette end of the
rotating part. It drives the cassette holder (and the film cassette) linearly across the X-ray
beam during the exposure and back during return. In cephalostatic models it also takes care
of opening the secondary collimator wide enough and of moving the soft tissue wedge. It is a
stepper motor and it gets it's drive from the generator processor.
Chapter I - FUNCTIONAL DESCRIPTION
Planmeca Proline XC X-ray unit I-15